tests: better test initializing allowing for better printing (#5379)

Co-authored-by: Nerixyz <nerixdev@outlook.de>

tests/src/Test.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <ostream>
+
+class QString;
+class QStringView;
+class QByteArray;
+
+// This file is included in all TUs in chatterino-test to avoid ODR violations.
+std::ostream &operator<<(std::ostream &os, QStringView str);
+std::ostream &operator<<(std::ostream &os, const QByteArray &bytes);
+std::ostream &operator<<(std::ostream &os, const QString &str);
+
+// NOLINTBEGIN(readability-identifier-naming)
+// PrintTo is used for naming parameterized tests, and is part of gtest
+void PrintTo(const QByteArray &bytes, std::ostream *os);
+void PrintTo(QStringView str, std::ostream *os);
+void PrintTo(const QString &str, std::ostream *os);
+// NOLINTEND(readability-identifier-naming)